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Acronym for "I Have a Dildo Up Me Arse", a term relating to a person with an extremely strange walk and sits down very gingerly so much so that it appears they have some sort of large sex aid inserted into their anus and it is causing extreme discomfort
Cor look at jason over there, never seen anyone walking and sitting down like that, looks like he's got a 12 incher up his arse, he's IHADUMA, it's gonna be the end of him if he doesn't remove it
IHADUMA by davethejag July 13, 2010
Related Words
IHaxU IHABU IHADUMA ihaou
ihaou.
ihaou by SamanthaCows December 11, 2011
Stands for "It Has Always Been Understood"

Used to pretend that something was obviously agreed upon when actually you never discussed it with anyone.

Typically used when a project manager has no clue what their project is about, has never shown any interest in it, and wakes up at the 11th hour all panicky because things don't work like they dreamt they would.
Nuclear reactor starts melting
Project Manager: IHABU there would be an emergency stop button on the reactor!
IHABU by M The Corruptor May 27, 2019